<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>04-后代选择器</title>
    <style>
        div span {
            color: red;
        }
    </style>
</head>
<body>

<span>span1</span>
<span>span2</span>
<span>span3</span>

<div>
    <span>span4</span>
    <span>span4</span>
    <span>span4</span>
    <span>span4</span>
</div>

<div>
    <p>
        <strong><span>span5</span></strong>
    </p>
</div>

</body>
</html>